#app {
    width: 1000px;
    margin: 0 auto;
    position: relative;
}

.app-img {

    width: 1000px;
}

.app-img img {
    width: 1000px;
}

.seckill-wrap {
    display: none;
}

.masking {
    width: 1000px;
    height: 1000px;
    background-color: #fff;
    opacity: 0.7;
    position: fixed;
    top: 0px;
}

.seckill {
    width: 350px;
    height: 350px;
    position: fixed;
    top: 150px;
    left: 450px;
}



span {
    width: 20px;
    height: 20px;
    background-color: red;
    text-align: center;
    line-height: 20px;
    position: fixed;
    top: 170px;
    left: 743px;
    cursor: pointer;
}